Powers of fourth root of 2 rounded down.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =3a(8) =4a(9) =4a(10) =5a(11) =6a(12) =8a(13) =9a(14) =11a(15) =13a(16) =16a(17) =19a(18) =22a(19) =26a(20) =32a(21) =38a(22) =45a(23) =53a(24) =64a(25) =76a(26) =90a(27) =107a(28) =128a(29) =152